Abstract: Three-dimensional finite element model of breakwater-ground system is established for calculating the influence of traveling wave excitation based on elastoplastic constitutive model. Considering the dynamic breakwater-soil interaction, the model is solved by supercomputer based on contact balanced algorithm for explicit parallel computing. The difficulty of calculating the large-scale nonlinear finite element problems is solved based on this method. The settlement of wave barrier, the permanent deformation of breakwater and the bending moment of wave barrier under different wave velocities are researched. The results show that when considering the wave travelling effect of ground motion，the settlement of wave barrier increases with the wave velocity increasing, and gradually approaches the response of uniform excitation. The travelling wave effect has little effect on the residual deformation mode of breakwater, and the deformation mode under different wave velocities are almost the same. The permanent displacement of breakwater under SH wave excitation is bigger than the one under P wave excitation. In most cases, the bending moments of wave barrier under nonuniform excitation are bigger than ones under uniform excitation. The results are valuable for the choice of aseismic measures for breakwater.

Key words: breakwater, seismic response, traveling wave, parallel calculation, 3D finite elements, numerical simulation